Thermodynamic analysis and optimization design of alkaline water electrolysis hydrogen production system for offshore wind power
[Objectives]In order to fully leverage electricity and seawater resources,this paper carries out the thermodynamic analysis and optimization design of an alkaline water electrolysis(AWE)hydrogen pro-duction system for offshore wind power.The focus comprises the impacts of operating pressure,temperature and lye flow rate on the operational characteristics of the system.[Methods]Thermodynamic,kinetic and flux balance analyses are carried out to develop a thermodynamic equilibrium model for hydrogen production by alkaline water electrolysis using Aspen Plus software,which is then validated in comparison with the exper-imental results.[Results]The optimum working pressure and temperature of the alkaline water electrolysis hydrogen production system are 9 bar and 70 ℃ respectively,and the optimum lye flow rate is 1 600 t/h.The system energy loss and exergy loss increase with the increase of input current density.When the alkaline wa-ter electrolysis input current density reaches 3 000 A/m2,the system energy efficiency and exergetic efficiency are 63.58%and 57.27%respectively,and the system energy loss accounts for 26%of the total energy input,of which the exergy loss of the electrolyzer is the highest,accounting for 93.39%of the total exergy loss of the system.[Conclusions]Through this parametric optimization method,a suitable range of operating paramet-ers can be obtained,providing useful references for the selection of offshore wind power hydrogen production parameters.
offshore wind poweralkaline water electrolysis hydrogen productionthermodynamic perform-anceparametric optimization
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